How to improve fragrance longevity, bath salts

Abstract

To provide a foamable compression-molded article with favorable fragrance emission and improved fragrance longevity, and a method for improving fragrance longevity in a foamable compression-molded article.SOLUTION: A bath additive comprises a foamable compression-molded article having a recess and comprising a perfume. The volume ratio of the recess to the foamable compression-molded article [volume of recess / volume of foamable compression-molded article] is 0.03 or more. When the bath additive is immersed in water, the bath additive temporarily retains generated gas within the recess and can release bubbles having a diameter of 1 cm or more into the water.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for improving the persistence of a fragrance, a foamable compression-molded product, and a bath additive. [Background technology]

[0002] In recent years, adding bath additives to bathwater has become commonplace, with the aim of adding a fragrance or color to the bathwater to make it feel more invigorating, stimulating metabolism to alleviate sensitivity to cold, and achieving a warming effect, and these are sold in various forms, such as bath salts, tablets, and liquid preparations. Among these, bath additives containing a carbon dioxide gas generator that combines carbonates and acids generate carbon dioxide gas in the bathwater, which dilates capillaries and increases metabolism, and are therefore expected to have effects such as promoting blood circulation and relieving fatigue.

[0003] Furthermore, one of the important effects expected from bath additives is the aromatherapy effect due to the scent, and in order to enhance this effect while bathing, it is important to maintain the scent stably. Therefore, Patent Document 1 reports a technology for enhancing the fragrance of bath additives by making the bath additives into granules with small particle diameters and large surface areas. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-062319 Summary of the Invention [Problem to be solved by the invention]

[0005] Until now, foaming bath additives that combine carbonates and acids have been popular in the form of tablets or other solids that sink in the bathwater to facilitate dissolution of the generated carbon dioxide gas into the bathwater. However, because these bath additives sink in the bathwater, they do not release as much fragrance as granular bath additives. On the other hand, adding a large amount of fragrance to solid compressed bath additives in order to enhance the release of the fragrance can lead to a deterioration in the stability of the formulation.

[0006] Another problem with compressed solid bath additives is that although the scent is easily noticeable immediately after dissolving, the scent does not last. In particular, the user who dissolves the additive in bathwater can easily detect the scent, but those who take a subsequent bath find it difficult to detect the scent.

[0007] Therefore, an object of the present invention is to provide an expandable compression-molded product that has good fragrance release and improved fragrance persistence, and to provide a method for improving the fragrance persistence of an expandable compression-molded product. In this invention, "fragrance release" means that the fragrance diffuses and is felt immediately after the expandable compression-molded product is dissolved in water or the like. [Means for solving the problem]

[0008] The present invention is as follows. (1) A bath additive comprising a foamable compression molded product having a recess and containing a fragrance, the volume ratio of the volume of the recessed portion to the volume of the expandable compression-molded product [volume of the recessed portion / volume of the expandable compression-molded product] is 0.03 or more; When the bath additive is submerged in water, the generated gas is temporarily trapped within the recess, and bubbles with a diameter of 1 cm or more are released into the water.

[0009] (2) The volume of the recess is 2000 mm 3 The bath additive described in (1) above. (3) The bath additive according to (1) or (2), wherein the volume ratio [volume of the recessed portion / volume of the foamable compression-molded product] is 0.15 or less. (4) Contains organic acids; The bath additive according to any one of (1) to (3), wherein the organic acid content is 10 to 65% by mass. (5) Contains carbonate; The bath additive according to any one of (1) to (4), wherein the carbonate content is 20 to 90 mass %.

[0010] (6) A method for improving the persistence of the fragrance of a fragrance by using a bath additive made of a foamable compression-molded product containing a fragrance, comprising: The expandable compression-molded product has a recess, the volume ratio of the volume of the recessed portion to the volume of the expandable compression-molded product [volume of the recessed portion / volume of the expandable compression-molded product] is 0.03 or more; The method for improving the persistence of fragrance of the bath additive is such that, when the bath additive is submerged in water, the gas generated is temporarily trapped within the recess and bubbles having a diameter of 1 cm or more are released into the water. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide an expandable compression-molded product that has a good fragrance and an improved fragrance durability, and also to improve the fragrance durability of the expandable compression-molded product. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view of an expandable compression-molded product according to an embodiment of the present invention. [Figure 2] FIG. 2 is a top view of an expandable compression-molded product according to an embodiment of the present invention. [Figure 3] FIG. 3 is a cross-sectional view of an expandable compression-molded product according to an embodiment of the present invention. [Figure 4] FIG. 4 is a cross-sectional view of an expandable compression-molded product according to an embodiment of the present invention. [Figure 5] FIG. 5 is a graph showing the change over time in the fragrance intensity of the expandable compression-molded products of Examples 1 to 4 and Comparative Example 1. [Figure 6] FIG. 6 is a graph showing the change over time in the fragrance intensity of the expandable compression-molded products of Examples 5 to 7. [Figure 7]FIG. 7 is a graph showing the change over time in the fragrance intensity of the expandable compression-molded products of Examples 8 to 10 and Comparative Example 2. [Figure 8] FIG. 8 is a graph showing the change over time in fragrance intensity of the expandable compression-molded products of Examples 11 to 13. [Figure 9] FIG. 9 is a graph showing the change over time in the fragrance intensity of the expandable compression-molded products of Examples 14 to 18. DETAILED DESCRIPTION OF THE INVENTION

[0013] [Method for improving fragrance durability] The method for improving the fragrance persistence of this embodiment is a method for improving the fragrance persistence of a fragrance using an expandable compression-molded product containing a fragrance. Here, the expandable compression-molded product has a top surface, a bottom surface, and a side surface, and at least one of the top surface and the bottom surface has a recess. In the method for improving the fragrance persistence of this embodiment, the expandable compression-molded product is placed so that the top surface having the recess or the bottom surface having the recess contacts the bottom of a water tank, and is reacted with water. This method can improve the persistence of the fragrance of the fragrance. The reason for this is thought to be that the gas generated in the water temporarily remains in the depressions, and the retained gas combines with itself to form large bubbles that are released into the water, and the large bubbles burst near the water surface, increasing the intensity of the fragrance, and the continuous generation of large bubbles makes it easier to continuously release a strong fragrance. The expandable compression molded product will be described in detail later.

[0014] In the method for improving the persistence of a fragrance of this embodiment, it is preferable to use hot water (35 to 45°C) rather than cold water in order to optimize the release of the fragrance. Furthermore, it is preferable to use 100 to 200 L of hot water per expandable compression-molded product.

[0015] [Expandable compression molded product] Fig. 1 shows a perspective view of an expandable compression-molded product 100 of this embodiment. Fig. 2 shows a top view of the expandable compression-molded product 100 of this embodiment. Fig. 3 is a cross-sectional view of the expandable compression-molded product 100 of this embodiment, which is a cross-sectional view taken along line AA of the expandable compression-molded product 100 of Fig. 2. Fig. 4 is a cross-sectional view of an expandable compression-molded product 200 according to another embodiment of the present invention. The expandable compression molded products 100 and 200 have a top surface 1, a bottom surface 2, and a side surface 3. The expandable compression molded product 100 in FIG. 1 is cylindrical, but is not particularly limited thereto. In order for the expandable compression molded product to have a top surface, a bottom surface, and a side surface, it is preferably cylindrical, and more preferably cylindrical or polygonal. When the expandable compression molded product has a cylindrical shape, the top surface is one surface that intersects with the axial direction of the expandable compression molded product, and the bottom surface is the other surface that intersects with the axial direction of the expandable compression molded product.

[0016] The expandable compression-molded product of this embodiment has a recess on at least one of its top and bottom surfaces. As shown in Figures 1 to 3, it may have a recess 11 on top surface 1, or may have a recess on the bottom surface (not shown). As shown in Figure 4, it may have recesses 11, 21 on both top surface 1 and bottom surface 2, respectively. From the viewpoint that the effects of the present invention can be obtained regardless of whether the top surface or bottom surface is placed so that it is in contact with the bottom of the water tank, it is preferable to have recesses on both the top surface and the bottom surface, because when the expandable compression-molded product is placed in a bathtub or the like, the recesses will be in contact with the bottom of the water layer without having to be aware of the positional relationship between the recesses and the bottom of the water layer.

[0017] As shown in Figures 1 to 4, the shape of the top surface 1 having the recess 11 other than the recess may have an edge 12 and a chamfered portion 13 connected to the side surface 3. The edge 12 is preferable because it makes it easier for bubbles to remain in the space within the recess. The edge 12 is preferably formed so as to surround the periphery of the recess, and may have a notch (groove) in part to adjust the size of the bubbles and allow them to be discharged. It is more preferable to have an edge that surrounds the entire periphery of the recess. Furthermore, the chamfered portion 13 is preferable because it can prevent cracking and chipping of the expandable compression-molded product.

[0018] As shown in FIG. 4, even when the bottom surface 2 has a recess 21, the bottom surface 2 may have an edge portion 22 and a chamfered portion 23 connected to the side surface 3 in addition to the recess.

[0019] Although not shown, the shape of the recess is not limited. It may be hemispherical as shown in Figures 1 to 4, spherical, polyhedral, columnar, or a combination thereof. The cross-sectional shape of the recess in a direction intersecting the axial direction may be circular, elliptical, star-shaped, cross-shaped, polygonal, or any of various character shapes, or a combination thereof. Furthermore, the recess may have various other irregular shapes. The number of recesses is not limited as long as it is one or more, and may be two or more.

[0020] The expandable compression molded product of this embodiment has a recessed portion having a volume of preferably 2000 mm 3 More than 2500mm, preferably 2500mm 3 The volume of the recess is 2000 mm 3 By setting the volume of the recess to 6000 mm or more, bubbles tend to remain in the space within the recess, and large bubbles tend to form. 3 Less than or equal to 5500mm, preferably 3 Less than 5000mm, more preferably 3 The volume of the recess is 6000 mm or less. 3 By keeping the volume of the recesses within the above range, it is possible to prolong the period during which large bubbles are generated, thereby improving the release and persistence of the fragrance of the flavor. The volume of the recess can be calculated, for example, by filling the recess of the expandable compression molded product with sodium sulfate (powder) of known bulk density loosely to the level without tapping, and then calculating it from the mass of the filled sodium sulfate and the bulk density.

[0021] In order to obtain the desired shape and volume of the recesses, for example, when compression molding the expandable compression molded product, a compression molding mold having convex portions of the desired shape and volume is used to form the recesses by transferring the shape of the convex portions, or after compression molding the flat top or bottom surface, the top or bottom surface is scraped to obtain the desired shape and volume.

[0022] In the expandable compression molded product of this embodiment, the volume ratio of the volume of the recessed portion to the volume of the expandable compression molded product [volume of recessed portion / volume of expandable compression molded product] is preferably 0.03 or more, more preferably 0.04 or more. It is believed that when the bubbles remaining in the recessed portion of the expandable compression molded product grow to a certain size and their buoyancy increases, the expandable compression molded product floats up, and large bubbles are released into the water through the resulting gaps. A volume ratio of the volume of the recessed portion to the volume of the expandable compression molded product of 0.03 or more is preferred because it facilitates the occurrence of the above phenomenon and improves the release and persistence of the fragrance. The upper limit of the volume ratio of the volume of the recessed portion to the volume of the expandable compression molded product is preferably 0.15 or less, more preferably 0.1 or less. A volume ratio of the volume of the recessed portion to the volume of the expandable compression molded product of 0.15 or less can prevent the expandable compression molded product from cracking or chipping during line conveyance or transportation. Furthermore, when the expandable compression-molded product is dissolved, the time for which large bubbles are continuously generated can be extended by lengthening the time until the top and bottom surfaces of the expandable compression-molded product are penetrated.

[0023] The expandable compression-molded product of this embodiment preferably has a maximum diameter of 65 mm or more, more preferably 68 mm or more. A maximum diameter of 65 mm or more is preferable because it can further increase the persistence of the scent. The upper limit of the maximum diameter is preferably 80 mm or less, more preferably 75 mm or less. A maximum diameter of 80 mm or less can prevent the expandable compression-molded product from cracking or chipping during line conveyance or transportation. The maximum diameter refers to the diameter of a circumscribing circle when the expandable compression-molded product is viewed from the axial direction.

[0024] From the viewpoint of fragrance durability, the expandable compression-molded product of this embodiment preferably has a thickness of 13 mm or more, more preferably 16 mm or more, and preferably 20 mm or less, more preferably 18 mm or less.

[0025] The expandable compression molded product of the present embodiment preferably has a density of 1.3 g / cm 3 More preferably, 1.6 g / cm 3 or more, preferably 2.5 g / cm 3 or less, more preferably 2.0 g / cm 3 By keeping the foaming amount within the above range, an appropriate foaming amount can be achieved, resulting in good fragrance release and long-lasting fragrance of the fragrance. Furthermore, cracking and chipping of the expandable compression-molded product during conveyance on the line or during transportation can be suppressed.

[0026] From the viewpoint of the persistence of the fragrance, the expandable compression molded product of the present embodiment preferably has a volume of 40,000 mm 3 More than 50,000 mm 3 This is more than 75,000 mm, and cracking or chipping of the expandable compression molded product can be suppressed during conveyance on the line or during transportation. 3 Less than or equal to 65,000 mm, preferably 3 The content is as follows: When the content is within the above range, the fragrance will have good fragrance release and long-lasting properties.

[0027] The expandable compression-molded product of the present embodiment has a mass of preferably 52 g or more, more preferably 80 g or more, and even more preferably 90 g or more, and preferably 150 g or less, more preferably 120 g or less, and even more preferably 100 g or less. Within the above ranges, the amount of carbon dioxide gas foaming can be increased, thereby improving the release and persistence of the fragrance.

[0028] The foamable compression molded product of this embodiment preferably has a foaming volume of 700 mL or more, more preferably 800 mL or more, and even more preferably 1300 mL or more. A foaming volume of 700 mL or more can increase the persistence of the fragrance. The upper limit is preferably 2000 mL or less, more preferably 1400 mL or less. A foaming volume of 2000 mL or less can increase the amount of carbon dioxide gas dissolved in the bath water. In addition, nausea caused by powder in the foamable compression molded product flying up due to foaming can be suppressed. The foaming amount can be determined, for example, by placing one tablet of the foamable compression-molded product in a metal mesh basket (10 cm in diameter x 10 cm in height), immersing this in 200 L of bath water at 40°C, placing an upside-down funnel just above the top of the metal mesh basket in the water, and collecting all of the generated carbon dioxide gas in a measuring cylinder, and measuring the amount of carbon dioxide gas generated. In order to achieve a desired foaming amount, for example, the types and contents of the organic acid and carbonate may be adjusted.

[0029] The disintegration time of the expandable compression-molded product of this embodiment is preferably 180 seconds or more, 190 seconds or more, 210 seconds or more, 240 seconds or more, 270 seconds or more, 300 seconds or more, 330 seconds or more, or 360 seconds or more, and is preferably 960 seconds or less, 930 seconds or less, 900 seconds or less, 840 seconds or less, 780 seconds or less, 720 seconds or less, 660 seconds or less, 600 seconds or less, 540 seconds or less, 480 seconds or less, or 420 seconds or less. By setting the disintegration time within the above range, the fragrance immediately after dissolving the expandable compression-molded product can be satisfactorily strong, while the fragrance persistence can be increased. Furthermore, the carbon dioxide concentration in the bathwater can be efficiently increased. The disintegration time is the time required for the expandable compression molded product to completely dissolve. In order to achieve a desired disintegration time, for example, the compounding ratio of the organic acid and carbonate in the expandable compression-molded product, the mass, volume, density or tableting pressure may be adjusted.

[0030] The expandable compression-molded product of this embodiment can release bubbles with a diameter of 1 cm or more into water. By generating large bubbles with a diameter of 1 cm or more, the user can feel a strong scent when the large bubbles burst near the water surface. The number of bubbles having a diameter of 1 cm or more generated per tablet of the expandable compression-molded product is preferably 50 or more, more preferably 80 or more. In order to release a predetermined number of bubbles with a diameter of 1 cm or more into water, as described above, the foamable compression molded product is placed so that the top surface having a recess or the bottom surface having a recess is in contact with the bottom of the tank, preferably the volume of the recess is a certain amount or more, and preferably the ratio of the volume of the recess to the volume of the foamable compression molded product is a certain amount or more.

[0031] The expandable compression-molded product of this embodiment preferably generates bubbles with a diameter of 1 cm or more for a period of 60 seconds or more, more preferably 120 seconds or more. The continuous generation of large bubbles allows the continuous release of a strong fragrance, improving the persistence of the fragrance. The period for generating bubbles with a diameter of 1 cm or more can be set within the above range by adjusting, for example, the volume of the recesses, the ratio of the volume of the recesses to the volume of the expandable compression-molded product, the amount of foaming, the collapse time, etc.

[0032] Next, each of the blending components of the expandable compression molded product of this embodiment will be described.

[0033] (fragrance) Flavorings include natural flavorings extracted from various plants and animals, synthetic flavorings that are chemically synthesized, and compound flavorings made by mixing a number of these flavoring ingredients. Fragrances that can be used include those described in various literature, such as "Perfume and Flavor Materials of Natural Origin," Steffen Arctander, Allured Pub. Co. (1960), "Encyclopedia of Fragrances," edited by the Japan Fragrance Manufacturers Association, Asakura Shoten (1989), "Flower Oils and Floral Compounds in Perfumery," Danute Pajaujis Anonis, Allured Pub. Co. (1993), "Perfume and Flavor Chemicals (aroma chemicals)," Vols. I and II, Steffen Arctander, Allured Pub. Co. (1994), "Fundamentals of Fragrances and Perfume Blending," edited by Nakajima Mototaka, Sangyo Tosho (1995), "Synthetic Fragrances: Chemistry and Product Knowledge," written by Indo Genichi, The Chemical Daily (1996), and "Encyclopedia of Fragrances," edited by Yatagai Mitsukatsu, Maruzen (2005). Each of the above is incorporated herein by reference. Representative examples of fragrances are listed below, but are not limited to these.

[0034] Examples of natural fragrances include natural essential oils such as orange oil, lemon oil, lavender oil, lavandin oil, bergamot oil, patchouli oil, cedarwood oil, and peppermint oil. Examples of synthetic fragrances include hydrocarbon terpenes such as α-pinene, β-pinene, limonene, p-cymene, terpinolene, α-terpinene, γ-terpinene, α-phellandrene, myrcene, camphene, and ocimene; heptanal, octanal, decanal, benzaldehyde, salicylic aldehyde, phenylacetaldehyde, citronellal, hydroxycitronellal, hydrotropic aldehyde, ligustral, citral, α-hexylcinnamic aldehyde, and α- Aldehydes such as amyl cinnamic aldehyde, lilial, cyclamen aldehyde, lyral, heliotropin, anisaldehyde, helional, vanillin, and ethyl vanillin; ethyl formate, methyl acetate, ethyl acetate, methyl propionate, methyl isobutyrate, ethyl isobutyrate, ethyl butyrate, propyl butyrate, isobutyl acetate, isobutyl isobutyrate, isobutyl butyrate, isobutyl isovalerate, and ethyl-2-methylvalerate. Acetate, Isoamyl Acetate, Terpinyl Acetate, Isoamyl Propionate, Amyl Propionate, Amyl Isobutyrate, Amyl Butyrate, Amyl Isovalerate, Allyl Hexanoate, Ethyl Acetoacetate, Ethyl Heptylate, Heptyl Acetate, Methyl Benzoate, Ethyl Benzoate, Ethyl Octylate, Styrallyl Acetate, Benzyl Acetate, Nonyl Acetate, Bornyl Acetate, Linalyl Acetate, Ortho-tert-Butylcyclohexyl Esters and lactones such as methyl acetate, linalyl benzoate, benzyl benzoate, triethyl citrate, ethyl cinnamate, methyl salicylate, hexyl salicylate, hexyl acetate, hexyl butyrate, menthyl acetate, terpinyl acetate, anisyl acetate, phenylethyl isobutyrate, methyl jasmonate, methyl dihydrojasmonate, ethylene brassylate, γ-undecalactone, γ-nonyl lactone, cyclopentadecanolide, and coumarin;Ethers such as anisole, p-cresyl methyl ether, dimethylhydroquinone, methyl eugenol, β-naphthol methyl ether, β-naphthol ethyl ether, anethole, diphenyl oxide, rose oxide, galaxolide, and ambrox; isopropyl alcohol, cis-3-hexenol, heptanol, 2-octanol, dimetol, dihydromyrcenol, linalool, benzyl alcohol, citronellol, geraniol, nerol, terpineol, tetrahydrogeraniol, l-menthol, cedrol, santalol, thymol, anise alcohol, phenylethyl alcohol, hexyl alcohol Examples of fragrances include alcohols such as sanol, diacetyl, menthone, isomenthone, thiomenthone, acetophenone, α- or β-damascone, α- or β-damascenone, α-, β-, or γ-ionone, α-, β-, or γ-methylionone, methyl-β-naphthyl ketone, benzophenone, thiamin, acetylcedrene, α- or β-isomethylionone, α-, β-, or γ-irone, ketones such as maltol, ethyl maltol, cis-jasmone, dihydrojasmone, l-carvone, dihydrocarvone, and methyl amyl ketone, camphor, 1,8-cineole, allyl amyl glycolate, isopulegol, and allyl caproate. These fragrances can be used alone or in any combination of two or more to form a blended fragrance. Furthermore, fragrances can also be used as a mixture (fragrance composition) containing fragrance ingredients, solvents, fragrance stabilizers, and the like.

[0035] Examples of the solvent for the fragrance include water, alcohols such as ethanol, propanol, and benzyl alcohol, polyhydric alcohols such as ethylene glycol, diethylene glycol, dipropylene glycol, glycerin, and 1,3-butanediol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, diethylene glycol monobutyl ether, diethylene glycol monoisobutyl ether, triethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol dimethyl ether, and dipropylene glycol monomethyl ether. Examples of suitable solvents include glycol ethers such as propylene glycol monomethyl ether, tripropylene glycol monomethyl ether, tripropylene glycol monobutyl ether, propylene glycol monopropyl ether, dipropylene glycol monopropyl ether, propylene glycol monobutyl ether, propylene glycol-tert-butyl ether, dipropylene glycol monobutyl ether, dipropylene glycol dimethyl ether, phenyl carbitol, phenyl cellosolve, and benzyl carbitol; paraffins such as n-paraffin; esters such as diethyl phthalate, benzyl benzoate, triethyl citrate, and isopropyl myristate; and others such as 3-methyl-4-methoxybutanol, N-methylpyrrolidone, and propylene carbonate. These solvents can be used alone or in any combination of two or more. They can also be mixed with the above-mentioned fragrance components to form a fragrance composition.

[0036] The expandable compression-molded product of the present embodiment preferably contains a fragrance component having a vapor pressure at 25°C (hereinafter sometimes simply referred to as vapor pressure) of 0.00002 to 120 mmHg, more preferably 0.001 to 120 mmHg, and even more preferably 0.1 to 120 mmHg. If the vapor pressure of the fragrance component is within this range, it is preferred because it is easily volatilized from the bathwater.

[0037] Examples of fragrance components having a vapor pressure of 0.00002 to 120 mmHg include limonene, pinene, myrcene, camphene, geraniol, citronellol, linalool, linalyl acetate, phenethyl acetate, isobornyl acetate, isoamyl acetate, amyl acetate, ethyl butyrate, ethyl vanillin, α-hexyl cinnamic aldehyde, ethyl acetate, tonalide, nerol, hexyl acetate, cineole, decanal, eugenol, borneol, indole, cresol, benzyl benzoate, butyl acetate, terpineol, γ-decalactone, and δ-decalactone. Examples of suitable fragrance ingredients include hydroxybenzoates, ...

[0038] The vapor pressures of the above fragrance ingredients at 25°C are shown in Table 1 below.

[0039] [Table 1]

[0040] Fragrance ingredients that are less soluble in water are preferable because this increases the persistence of the scent. If the fragrance ingredient is not easily soluble in water (bath water), when the bubbles pop near the water surface, the fragrance ingredient present around the bubbles will diffuse into the air, increasing the intensity of the scent. From the viewpoint of fragrance persistence, the solubility of the fragrance component in water is preferably 100 mg / mL or less, more preferably 20 mg / mL or less, and even more preferably 2 mg / mL or less, and is preferably 0.000001 mg / mL or more, more preferably 0.001 mg / mL or more, and even more preferably 0.005 mg / mL or more. The solubility of a fragrance ingredient in water is an index that indicates how much of the fragrance ingredient dissolves in water, and is expressed in mg as the mass of the fragrance ingredient that dissolves in 1 mL of water at 25°C. Among the fragrance ingredients listed above, the following have a water solubility of 20 mg / mL or less: cineole (0.3321 mg / mL), limonene (0.00757 mg / mL), menthone (0.688 mg / mL), linalool (1.59 mg / mL), citral (0.59 mg / mL), terpineol (7.1 mg / mL), hexyl acetate (0.511 mg / mL), citronellol (0.2 mg / mL), nerol (0.531 mg / mL), geraniol (0.1 mg / mL), eugenol (2.46 mg / mL), vanillin (11.02 mg / mL), ethyl vanillin (2.822 mg / mL), galaxolide (0.00175 mg / mL), benzyl benzoate (0.0154 mg / mL), and butyl cyclohexyl acetate (0.003552 mg / mL).

[0041] The expandable compression-molded product of the present embodiment preferably contains the above-mentioned flavor component in an amount of 0.1 to 2% by mass, more preferably 0.3 to 1% by mass.

[0042] (organic acid) The expandable compression-molded product of the present embodiment preferably contains a component that generates carbon dioxide gas, such as a carbonate and an organic acid. Carbon dioxide gas can be generated by the reaction between the carbonate and the organic acid.

[0043] Examples of organic acids include succinic acid, fumaric acid, malic acid, adipic acid, tartaric acid, benzoic acid, citric acid, and salicylic acid. From the viewpoints of ease of handling and economy, succinic acid or fumaric acid is preferred. These organic acids can be used alone or in combination of two or more.

[0044] Furthermore, from the viewpoints of tableting, granulation, solubility, and oil absorption capacity, the particle size (average particle size d50) of the organic acid is preferably 0.03 to 1 mm, more preferably 0.05 to 0.5 mm. When the particle size of the organic acid is within the above range, it is less likely to remain undissolved in the liquid, and it is preferable because it foams efficiently and diffuses the aroma of the fragrance.

[0045] If the particle size is larger than the above, it is preferable to crush the material in advance to a suitable particle size. Crushers that can be used for crushing include impact crushers such as hammer crushers, atomizers, and impact crushers such as pin mills, and shear crushers such as flash mills. These may be used in a single-stage operation or in a multi-stage operation using the same or different types of crushers.

[0046] The content of the organic acid in 100% by mass of the expandable compression-molded product is preferably 10 to 65% by mass. If the content of the organic acid is 10% by mass or more, sufficient carbon dioxide gas can be generated when the organic acid reacts with carbonate to generate carbon dioxide gas. The content of the organic acid is more preferably 15% by mass or more, and even more preferably 20% by mass or more. Furthermore, from the viewpoint of suppressing undissolved residue, the content of the organic acid is preferably 65% ​​by mass or less, more preferably 55% by mass or less, even more preferably 40% by mass or less, and particularly preferably 30% by mass or less. By setting the content within the above range, it is possible to suppress stuffiness caused by powder in the expandable compression-molded product flying up due to foaming.

[0047] (carbonate) The carbonate may be any that reacts with an organic acid in a liquid to generate carbon dioxide gas, and examples thereof include sodium carbonate, sodium bicarbonate, sodium sesquicarbonate, calcium carbonate, potassium carbonate, magnesium carbonate, etc. One or more of these may be used. Among these, it is more preferable to use sodium carbonate and sodium bicarbonate.

[0048] The content of carbonate in 100% by mass of the expandable compression-molded product is preferably 20 to 90% by mass. If the content of carbonate is 20% by mass or more, sufficient carbon dioxide gas can be generated when reacting with an organic acid to generate carbon dioxide gas. The content of carbonate is more preferably 30% by mass or more, and even more preferably 40% by mass or more. Furthermore, the content of carbonate is preferably 80% by mass or less, more preferably 75% by mass or less, and even more preferably 65% ​​by mass or less. Within the above range, the amount of foaming per unit time can be increased, and vigorous foaming can be obtained, thereby improving the release of the fragrance of the fragrance.

[0049] The particle size (average particle size d50) of the carbonate is preferably 0.03 to 1 mm, more preferably 0.05 to 0.5 mm. Within the above range, the expandable compression-molded product has an appropriate hardness and can maintain the expansion time (disintegration time).

[0050] (Other ingredients) The expandable compression-molded product used in the embodiment of the present invention may contain other components as appropriate, even if they are not the components described above, as long as the problem of the present invention can be solved. Examples of other components include inorganic salts, sugars, lubricants, opacifiers, binders, humectants, surfactants, enzymes, colorants, pigments, minerals, vitamins and their derivatives, anti-fading agents, pH adjusters, and disinfectants. The uses of these other components may overlap.

[0051] phosphates such as sodium phosphate, sodium polyphosphate, and calcium hydrogen phosphate; silicates such as calcium silicate and magnesium silicate; sulfides such as sulfur, calcium sulfide, sodium sulfide, potassium sulfide, ammonium sulfide, barium sulfide, zinc sulfide, tin sulfide, antimony sulfide, iron sulfide, and phosphorus sulfide; silicon compounds such as metasilicic acid, mica powder, and neutral clay; hydroxides such as sodium hydroxide and calcium hydroxide; borax, boric acid, calcium oxide, potassium bromide, potassium permanganate, artificial callus salt, mineral springs, mineral sand, and hot spring deposits. These inorganic salts may also be contained as bulk adjusters, formulation aids, and formulation stabilizers.

[0052] The content of inorganic salts in 100% by mass of the expandable compression-molded product is preferably 2.5% by mass or more, more preferably 5% by mass or more, and even more preferably 10% by mass or more. Also, it is preferably 40% by mass or less, more preferably 30% by mass or less, and even more preferably 20% by mass or less. By being within the above range, the expandable compression-molded product can have excellent shape retention and good solubility.

[0053] Examples of sugars include glucose, fructose, lactose, maltose, sucrose, maltodextrin, cyclodextrin, maltose, fructose, and trehalose. The sugar content in 100% by mass of the expandable compression-molded product of this embodiment is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and even more preferably 0.5% by mass or more, and is preferably 15% by mass or less, more preferably 10% by mass or less, and even more preferably 3% by mass or less. Within the above range, the expandable compression-molded product can have excellent shape retention and good solubility.

[0054] Examples of lubricants include talc, kaolin, magnesium stearate, calcium stearate, stearic acid, silicic anhydride, sucrose fatty acid ester, silicone oil, and liquid paraffin, with silicic anhydride, sucrose fatty acid ester, magnesium stearate, and liquid paraffin being preferred. The foaming time (disintegration time) of the expandable compression-molded product of this embodiment can be adjusted by adding a lubricant. For example, the foaming time (disintegration time) can be extended by increasing the amount of lubricant added. The lubricant is preferably contained in an amount of 0.001 to 1.0% by mass, more preferably 0.01 to 0.5% by mass, relative to 100% by mass of the expandable compression-molded product. By containing the lubricant in the above range, the flowability can be improved when the raw materials are mixed.

[0055] Examples of opacifying agents include titanium oxide.

[0056] Examples of binders include polyalkylene glycol, polyvinylpyrrolidone, dextrin, etc. Among these, polyalkylene glycol is preferred. The molecular weight of the polyalkylene glycol is preferably 100 to 20,000, more preferably 400 to 15,000, and even more preferably 2,000 to 10,000. Specifically, polyethylene glycol, polypropylene glycol, etc. are used, with polyethylene glycol being particularly preferred. One or more of various polyalkylene glycols can also be used in combination. The inclusion of a binder allows the foaming time (disintegration time) of the expandable compression-molded product to be adjusted. For example, the foaming time (disintegration time) can be extended by increasing the amount of binder added.

[0057] Examples of moisturizing agents include ceramides such as ceramide, ceramide derivatives, and ceramide analogues; organic acid salts such as sodium lactate, disodium tartrate, sodium pyrrolidonecarboxylate, and disodium glutamate; mucopolysaccharides such as chondroitin sulfate and hyaluronic acid; plant collagen obtained from soybeans, corn, carrots, etc.; marine collagen obtained from salmon, pufferfish, tuna, flounder, etc.; fatty acid esters such as isopropyl myristate and isopropyl palmitate, shea butter, squalane, placenta, arbutin, casein, silk, honey, jojoba oil, ginger extract, pueraria root extract, and cationized cellulose.

[0058] Examples of surfactants include nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene hydrogenated castor oil, polyoxyethylene polyoxypropylene copolymers, polyoxyethylene fatty acid esters, and sorbitan fatty acid esters; anionic surfactants such as fatty acid esters such as soap bases, sodium α-olefin sulfonate, sodium alkyl glucoside sulfate, sodium lauryl sulfate, polyoxyethylene sodium lauryl sulfate, and sodium coconut oil fatty acid methyl taurate; amphoteric surfactants such as alkyl betaine, alkylamidopropyl betaine, alkylamido sulfobetaine, and 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine; and cationic surfactants such as alkylamine salts and quaternary ammonium salts.

[0059] Examples of enzymes include trypsin, α-chymotrypsin, bromelain, papain, protease, proctase, serratiopeptidase, lysozyme, pepsin, and ficin.

[0060] Examples of pigments include legal pigments such as Blue No. 1, Blue No. 2, Red No. 102, Red No. 106, Red No. 227, Red No. 230 (1), Yellow No. 4, Yellow No. 5, Yellow No. 202 (1), Green No. 3, Green No. 201, Green No. 204, and Orange No. 205, as well as chlorophyll, riboflavin, annatto, and anthocyanin.

[0061] Examples of pigments and minerals include clay, red iron oxide, yellow iron oxide, mica, zinc oxide, bentonite, zeolite, metasilicic acid, acid clay, and coated particles (granules) thereof. These can also be contained as formulation aids.

[0062] Examples of vitamins and derivatives thereof include vitamin A, vitamin B, vitamin C, vitamin D, vitamin E, vitamin F, vitamin H, pantothenic acid, nicotinic acid or its derivatives, vitamin E nicotinate, tocopherol acetate, sodium ascorbate, etc.

[0063] Examples of the anti-fading agent include amino acids such as glycine, alanine, and glutamic acid, and salts thereof.

[0064] Examples of pH adjusters include disodium hydrogen phosphate, trisodium phosphate, disodium hydrogen citrate, and trisodium citrate.

[0065] Examples of disinfectants include isopropylmethylphenol, triclosan, dichloroisocyanuric acid, silver zeolite, cetylpyridinium chloride, benzalkonium chloride, benzothonium chloride, chlorhexidine, hinokitiol, phenol, glycyrrhizinate and derivatives thereof.

[0066] (Method of manufacturing expandable compression molded product) The expandable compression molded product of this embodiment can be produced by mixing the above components and compression molding. When compressing, the method is not particularly limited as long as it can produce an expandable compression molded product, for example, a tablet, and a known tablet press can be used. A tablet press is a device that fills a powder mixture into a die and compresses it between a lower punch and an upper punch to form a shape. There are single-punch tablet presses, in which a pair of upper and lower punches move up and down inside a single die to compress the mixture, and rotary tablet presses, in which dies are embedded at equal intervals around the periphery of a horizontally rotating turntable, and a series of operations - filling, compression, and ejection - are carried out continuously as the turntable rotates.

[0067] When using a tablet press, the size, thickness and shape of the tablets are preferably adjusted to the size, thickness and shape of the expandable compression-molded product of this embodiment described above. Furthermore, in order for the expandable compression molded product of this embodiment to have a concave portion on at least one of the top and bottom surfaces, it is preferable to use a tablet press in which at least one of the lower and upper punches has a convex portion of a shape corresponding to the concave portion of the expandable compression molded product, or to form a concave shape by scraping at least one of the top and bottom surfaces of the expandable compression molded product after molding.

[0068] From the viewpoint of moldability, the tableting pressure when using a tablet press is preferably 10 to 30 t, and more preferably 13 to 25 t. Tableting at a tableting pressure of 10 t or more prevents the tablets from becoming brittle and makes them less likely to crack or chip during line transfer or transportation. Furthermore, a tableting pressure of 30 t or less makes it less likely for capping to occur and makes it less likely for tablets to chip during line transfer or transportation. Furthermore, the size, thickness and density of the tablets can be adjusted by changing the tableting pressure.

[0069] The compression molding method is not limited, and the composition can be produced by a direct powder compression method (direct compression method) or a granule compression method (indirect compression method). The order of mixing the components and the method of mixing can be selected appropriately.

[0070] The expandable compression molded product of this embodiment has a good fragrance and the fragrance persistence is improved. Furthermore, by placing the expandable compression molded product of this embodiment so that the recessed side is in contact with the bottom of the water tank, the fragrance persistence of the fragrance can be improved.

[0071] Examples of uses of the foamable compression molded product of this embodiment include bath additives, air fresheners, deodorizers, foaming cleaners such as denture cleaners, flush toilet cleaners, and drain cleaners, foaming confectioneries, and head spa applications, and bath additives are preferred.

[0072] [Bath additives] The bath additive of this embodiment is made of a foamable compression molded product having a recess and containing a fragrance. When this bath additive is submerged in water, the generated gas is temporarily retained within the recess and bubbles with a diameter of 1 cm or more are released into the water. This improves the durability of the fragrance. The foamable compression molded product having a recess is preferably the foamable compression molded product of this embodiment. Furthermore, when the bath additive is submerged in water, it is preferable to place it so that the surface having the recess is in contact with the bottom of the aquarium.

[0073] Based on the above, the present specification discloses the following: [1] A method for improving the persistence of a fragrance of a fragrance by using an expandable compression-molded product containing the fragrance, The expandable compression-molded product has a top surface, a bottom surface, and a side surface, At least one of the top surface and the bottom surface has a recess; A method for improving the persistence of a fragrance, comprising placing the expandable compression-molded product so that the top surface having the recess or the bottom surface having the recess is in contact with the bottom of a water tank, and allowing the expandable compression-molded product to react with water. [2] The method for improving the persistence of a fragrance according to [1], wherein the foamable compression-molded product is a bath additive. [3] A foamable compression molded product containing a fragrance, The expandable compression-molded product has a top surface, a bottom surface, and a side surface, The expandable compression-molded article, wherein the top surface and the bottom surface have recesses. [4] The expandable compression molded product according to [3], wherein the expandable compression molded product is a bath additive. [5] The volume of the recess is 2000 mm 3 The expandable compression-molded product according to [3] or [4] above. [6] A bath additive comprising a foamable compression molded product having a recess and containing a fragrance, When the bath additive is submerged in water, the generated gas is temporarily trapped within the recess, and bubbles with a diameter of 1 cm or more are released into the water. [Example]

[0074] The present invention will be described in more detail below using examples, but the present invention is not limited to these.

[0075] [Examples 1 to 4, Comparative Example 1] A powder mixture was prepared by uniformly mixing the components according to the composition shown in Table 2. This powder mixture was compression-molded using a single-punch tablet press to produce cylindrical foamable compression-molded bath additives with the diameter, thickness, and recess volume shown in Table 3. The density of the foamed compression-molded products of Examples 1 to 4 and Comparative Example 1 was 1.7 g / cm. 3 It was decided. The recessed portion on the top surface was formed to a predetermined volume by scraping the surface of the expandable compression-molded product with a file, and the recessed portion on the bottom surface was formed by tableting using a lower punch having a convex portion. The volume of the recesses was calculated from the mass and bulk density of the sodium sulfate filled in the recesses of the expandable compression molded product by filling the recesses with sodium sulfate (powder) having a known bulk density. The fragrances shown in Table 2 are herbal fragrances whose main ingredients are linalool, linalyl acetate, citronellol, butyl cyclohexyl acetate, and limonene.

[0076] <Number of bubbles with a diameter of 1 cm or more and duration of occurrence> The bath additives of Examples 1 to 4 and Comparative Example 1 were evaluated under the following conditions for the number of bubbles having a diameter of 1 cm or more that were generated and the duration of generation. 200 L of hot water (40°C) was placed in the bathtub, and one bath additive tablet was placed in so that the top of the bath additive touched the bottom of the bathtub. Bubbles rising from the bath additive to the surface of the water were photographed every 10 seconds from above the surface of the water, and the number of bubbles 1 cm or larger in diameter that were generated every 10 seconds was counted, and the total number of bubbles 1 cm or larger in diameter that were generated until the foaming stopped was counted. The evaluation criteria are as follows: [Evaluation criteria] Total number of bubbles with a diameter of 1cm or more ○: 50 or more pieces △:10~49 pieces ×: 9 or less

[0077] Additionally, the period during which at least one bubble with a diameter of 1 cm or more appeared was calculated. The evaluation criteria are as follows: [Evaluation criteria] ○: 60 seconds or more △: 10 seconds to 59 seconds ×: Less than 9 seconds

[0078] <Fragrance intensity evaluation (after 2 hours)> 3.74m 3 In a bathroom with an enclosed space (1.6m (length) x 1.2m (width) x 1.95m (height)), 200L of hot water (40°C) was poured into the bathtub, and one bath additive tablet was added so that the top side of the bath additive was in contact with the bottom of the bathtub. After that, four expert panelists evaluated the fragrance intensity in the bathroom immediately after the bath additive had completely dissolved, and then 30 minutes, 1 hour, and 2 hours later. The evaluation criteria were as follows: [Evaluation criteria] 2 points: Almost no weakening immediately after dissolution 1 point: Became slightly weaker immediately after dissolving 0 points: The liquid has weakened considerably since dissolving The average of the evaluation results of each panelist was calculated. The evaluation criteria are as follows: [Evaluation criteria] Pass: 1 or more Fail: Less than 1

[0079] The results are shown in Table 3 and FIG. The disintegration time in the table refers to the time required for the expandable compression-molded product to completely dissolve.

[0080] [Table 2]

[0081] [Table 3]

[0082] It was confirmed that all test examples of Examples 1 to 4 and Comparative Example 1 had a sufficient fragrance intensity immediately after the entire amount of the bath agent was dissolved. From the above results, it can be seen that in Examples 1 to 4, where the bath additive was placed so that the concave side was in contact with the bottom of the bathtub, the fragrance intensity was good even after 2 hours, and the fragrance persistence was improved. On the other hand, in Comparative Example 1, where the bath additive was placed so that the flat side was in contact with the bottom of the bathtub, Although the fragrance intensity after 1 hour was within the acceptable standard, it was lower than in Examples 1 to 4, and the fragrance intensity after 2 hours was significantly lower, meaning that the persistence of the fragrance did not improve. The expandable compression-molded products of Examples 1 to 4, which have recesses on both the top and bottom surfaces, maintained a good fragrance intensity even after 2 hours, improving fragrance persistence. On the other hand, the expandable compression-molded product of Comparative Example 1, which has recesses on only one of the top and bottom surfaces, had a fragrance intensity after 1 hour that was within the acceptable standard, but was lower than that of Examples 1 to 4, and the fragrance intensity after 2 hours was significantly lower, showing no improvement in persistence. Furthermore, the bath additives of Examples 1 to 4, which were able to temporarily retain the generated gas within the recesses and release bubbles of 1 cm or more in diameter into the water, maintained a good fragrance intensity even after two hours, improving the persistence of the fragrance.On the other hand, the bath additive of Comparative Example 1, which did not generate bubbles of 1 cm or more in diameter, met the acceptable standard for fragrance intensity after one hour, but was lower than Examples 1 to 4, and after two hours the fragrance intensity was significantly lower, showing no improvement in persistence.

[0083] From the results of Examples 1 to 4, the volume of the recessed portion was 2000 mm3 ~6000mm 3 It was shown that good results could be obtained.

[0084] Furthermore, the results of Examples 1 to 4 showed that good results were obtained when the volume ratio of the volume of the recesses to the volume of the expandable compression molded product [volume of recesses / volume of the expandable compression molded product] was 0.03 to 0.15.

[0085] Examples 5 to 7 Except for the composition of the powder mixture shown in Table 4, cylindrical foamable compression-molded bath additives with the diameter, thickness, and recess volume shown in Table 5 were produced under the same conditions as in Example 1. As in Example 1, the number of bubbles with a diameter of 1 cm or more generated, the duration of generation, and the fragrance intensity were evaluated. The results are shown in Table 5 and FIG.

[0086] [Table 4]

[0087] [Table 5]

[0088] From the above results, even when the composition of the powder mixture was changed, according to the method of Examples 5 to 7, in which the bath additive was placed so that the side with the recessed portions was in contact with the bottom of the bathtub, the fragrance intensity remained good even after 2 hours, and the fragrance persistence was improved. Furthermore, the expandable compression-molded products of Examples 5 to 7, which had recessed portions on the top and bottom surfaces, maintained a good fragrance intensity even after 2 hours, and the fragrance persistence was improved. Furthermore, the bath additives of Examples 5 to 7, which were able to temporarily retain the generated gas within the recessed portions and release bubbles with a diameter of 1 cm or more into the water, maintained a good fragrance intensity even after 2 hours, and the fragrance persistence was improved.

[0089] [Examples 8 to 13, Comparative Example 2] Except for the composition of the powder mixture shown in Table 6, cylindrical foamable compression-molded bath additives having the diameter, thickness, and recess volume shown in Table 7 were produced under the same conditions as in Example 1. The density of the foamed compression-molded products of Examples 8 to 13 and Comparative Example 2 was 1.7 g / cm. 3 It was decided. In addition, similarly to Example 1, the fragrance intensity was evaluated. The results are shown in Table 7 and Figures 7 and 8.

[0090] [Table 6]

[0091] [Table 7]

[0092] From the above results, according to the method of Examples 8 to 13, in which the bath additive was placed so that the side with the recessed portion was in contact with the bottom of the bathtub, even when the type of fragrance was changed, the fragrance intensity remained good even after 2 hours, and the fragrance persistence was improved. Furthermore, the expandable compression-molded products of Examples 8 to 13, which had recessed portions on the top and bottom surfaces, maintained good fragrance intensity even after 2 hours, and the fragrance persistence was improved. Furthermore, the bath additives of Examples 8 to 13, which were able to temporarily retain the generated gas within the recessed portions and release bubbles with a diameter of 1 cm or more into the water, maintained good fragrance intensity even after 2 hours, and the fragrance persistence was improved.

[0093] Furthermore, comparing Examples 8 to 10, Example 9 containing limonene had better fragrance intensity ratings at 30 minutes, 1 hour, and 2 hours than Example 8 containing geraniol and Example 10 containing linalool. This is thought to be because limonene has a solubility of 0.00757 mg / mL, which is lower in water than geraniol and linalool, making it easier for linalool to diffuse when the bubbles burst. As shown in Examples 11 to 13, even at a mass of 80 g, Example 12 containing limonene had a better fragrance intensity rating than Example 11 containing geraniol and Example 13 containing linalool.

[0094] On the other hand, in the method of Comparative Example 2, in which the flat side of the bath additive was placed in contact with the bottom of the bathtub, the fragrance intensity after 1 hour met the pass standard, but after 2 hours the fragrance intensity significantly decreased, and the fragrance persistence was not improved. In addition, the foamable compression-molded product of Comparative Example 2, which has recesses on only one of the top and bottom surfaces, met the pass standard for fragrance intensity after 1 hour, but after 2 hours the fragrance intensity significantly decreased, and the fragrance persistence was not improved. Furthermore, the bath additive of Comparative Example 2, which did not generate bubbles with a diameter of 1 cm or more, met the pass standard for fragrance intensity after 1 hour, but after 2 hours the fragrance intensity significantly decreased, and the fragrance persistence was not improved.

[0095] Examples 14 to 18 Except for using the composition of the powder mixture shown in Table 8, a cylindrical foamable compression-molded bath additive was produced under the same conditions as in Example 1, with the diameter, thickness, and recess volume shown in Table 9. As in Example 1, the number of bubbles with a diameter of 1 cm or more generated, the duration of generation, and the fragrance intensity were evaluated. The fragrances shown in Table 8 are herbal fragrances whose main components are limonene, linalool, eugenol, cineole, and terpineol. The results are shown in Table 9 and FIG.

[0096] [Table 8]

[0097] [Table 9]

[0098] The above results show that even when the composition of the powder mixture was changed, the fragrance intensity remained good even after two hours, and the fragrance persistence was improved, according to the methods of Examples 14 to 18, in which the bath additive was placed so that the side with the recessed portions was in contact with the bottom of the bathtub. Furthermore, the foamable compression-molded products of Examples 14 to 18, which had recessed portions on the top and bottom surfaces, maintained good fragrance intensity even after two hours, and the fragrance persistence was improved. Furthermore, the bath additives of Examples 14 to 18, which were able to temporarily retain the generated gas within the recessed portions and release bubbles with a diameter of 1 cm or more into the water, maintained good fragrance intensity even after two hours, and the fragrance persistence was improved. [Industrial Applicability]

[0099] The expandable compression molded product of the present embodiment is useful for bath additives, air fresheners, deodorants, cleaning agents, effervescent confectionery, head spa applications, and the like. [Explanation of symbols]

[0100] 100, 200...Foamable compression molded products 1...Top surface 11...recess 12...Edge 13...Beveled part 2...Bottom 21...recess 22...Edge 23... Chamfered part 3...Side

Claims

1. A bath additive comprising a foamable compression-molded product containing a fragrance, the foamable compression-molded product having a recess and a rim surrounding the entire periphery of the recess, a volume ratio of the volume of the recessed portion to the volume of the expandable compression-molded product [volume of recessed portion / volume of expandable compression-molded product] of 0.04 to 0.15; When the bath additive is submerged in water, the generated gas is temporarily retained in the recess, and bubbles with a diameter of 1 cm or more can be released into the water.

2. The volume of the recess is 2000 mm ３ The bath additive according to claim 1.

3. Contains organic acids, 3. The bath additive according to claim 1, wherein the organic acid content is 10 to 65% by mass.

4. Contains carbonates, 3. The bath additive according to claim 1, wherein the carbonate content is 20 to 90% by mass.

5. A method for improving the persistence of a fragrance by using a bath additive made of a foamable compression-molded product containing a fragrance, comprising: The expandable compression-molded product has a recess and an edge portion surrounding the entire periphery of the recess, a volume ratio of the volume of the recessed portion to the volume of the expandable compression-molded product [volume of recessed portion / volume of expandable compression-molded product] of 0.04 to 0.15; The method for improving the persistence of a fragrance is such that, when the bath additive is submerged in water, the gas generated is temporarily retained within the recess and bubbles having a diameter of 1 cm or more are released into the water.

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